Ball-mill.



PATENTED FEB. 28, 1905.

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*OTTO SOIN, OF BRUNSNVICK, GERh/lANr'.

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SPECIFICATION forming part of Letters Patent No. 783,905, dated 'February 28, 1905.

Application filed March l, 1904. Serial No. 196,113.

Be it known that l, O'rfro Somit, engineer, a subject of the Emperor of Germany, residingI at Brunswick, Duchy of Brunswick, Empire of Germany, have invented certain new and useful Improvements in Ball-Mills, of which the following is a specilication.

This invention relates to ball-mills wherein a series of balls are disposed in circular alinement and pressed against a more or less perpendicular grinding-snrface as centrifugal power is developed by rotation of thesup porting means for the balls.

Heretofore ball-mills have been constructed with complex cases or compartments to receive the balls, and such cases or compartments have been generally closed on three sides and entail considerable expense in the manufacture of this class of mills by reason of the diiiiculties encountered in accurately and practically7 casting the cases in the supporting means of which they form a part. The production of these cases or compartments has also materially added weight to the mills, and if repair became necessary it could not be very readily accomplished, and renewal was almost impossible.

The object of the present invention is to include in a ballmi ll arotating body which serves the same purpose as the hollow cases heretofore ordinarily used, but having an arrangement and construction of a very simple and practical nature and wherein the balls are re tained in proper position during the operation of the mill and readily removable without requiring a complete or material disasseciation of the parts of the mill.

1n the drawings, Figure l is a vertical section showing a ball-mill embodying the features of the invention. Fig. 2 is a top plan of the same.

Similar letters of reference are employed to l inner portion of the lower' terminal of a fixed track-rim f, having an inner concave surface against which the balls operate. The rim and the dmvnwardly and outwardly flared body 7" are radially divided by vertical partitions it, which terminate at a distance inwardl y from the concave face of the liXed rim and have their upper edges below the corresponding edge of said rim. A driver /'is secured to one side of each partition and formed of material harder than the partition, the several drivers being of less radial extent than the partitions, and their contacting Vfaces are inclined to effectively drive the balls which are engaged thereby. The drivers increase in thickness toward their outer ends to prolong their wearing characteristics.

Balls (y are disposed in the compartments formed between the successive drivers and partitions, the balls boingI oif such diameter as to have loose play in the several compartments. By reason of the flaring construe tion of the body f and the upper open nature of the fixed rim the balls can be readily withdrawn from the compartments and replaced in the latter. lt is necessary to provide some means `for retaining the balls in their compartments during the operation of the mill, and in conformity with the present invention this means must be readily removable. To attain this result, a hollow frustoconical sleeve or cover c is provided and formed with a hub (Z, corresponding in contour to and removably and snugly fitted over the hub e of the body f. The hollow sleeve or cover o has a downwardly and oiitwardly curved iiare and terminates in a lower enlargement c, which has an upwardly-inclined contactingl edge normally located adjacent to the balls. When the cover c is in applied position, the distance between the lower enlarged edge and the upper edge of the fixed rim is materially less than the diameter of the balls,and hence the latter are free to move, but cannot ily out of position from between the partitions and drivers. The balls are always thrown outwardly, and their inward movement to too great an extent is resisted by the lower enlarged edge of the cover. The cover also rotates equally with the'body f and the balls carried by the latter and is held in rotatable relationV with respect to the hub e by a feather-and-groove Construction set up between the two hubs Z and e. An ordinary key might be used for the same purpose, but as particular means for establishing l downwardly and outwardly flares to a substantially horizontal rim, the latter being' provided with radial partitions, a fixed rim with which the rim of the body cooperates, and a cover removably and iix'edly held on the upper portion of the body and having its lower edge located inwardly at a distance from the upper edge of the iixed rim.

2. A ball-mill having a rotatable body with partitions radially arranged thereon, a driver secured to one side otV each partition, a fixed rim adjacent to which the said partitions have rotation, balls interposed between the drivers and partitions, and a cover freely removable from and ixedly held by the body, the said cover having its lower edge extending over a portion of the partitions.

In testimony whereoi1 I have hereunto set my hand in presence of two subscribing witnesses. OTTO SOINE.

Witnesses:

ILHELM ZELIoKE, JULIUs SECKEL. 

